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A Revision of the Eleotrid Goby Genus Odontobutis in Japan,Korea and China

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A Revision of the Eleotrid Goby Genus Odontobutis in Japan,Korea and China Japanese Journal of Ichthyology Vol.31,No.41985 魚 類 学 雑 誌 31巻4号1985年 A Revision of the Eleotrid Goby Genus Odontobutis in Japan,Korea and China Akihisa Iwata,Sang-Rin Jeon,Nobuhiko Mizuno and Ki-Chul Choi Received May 16,1984) ( Abstract The eleotrid goby genus Odontobutis in Japan,Korea and China is represented by two species and three subspecies i.e., O.obscura obscura,O.o.potamophila,O.o.interrupta subsp.nov. and O.platycephala sp.nov.The genus is characterized by the presence of smooth,feeble crests on the dorsal sides of the eyes,by the absence of a spine on the preopercle,by the absence of teeth on the vomer,by the wide gill openings,by the larger interorbital width to eye diameter ratio and by the predorsal scales which extend forward on the upper surface of the head to between the hind nostrils. Odontobutis platycephala is distinguished from 0.obscura by the presence of two sensory canals on the preoperculomandibular pit line.0.o.potamophila and O.o.interrupta are disin - guished from O.o.obscura by the presence of one postocular sensory canal on the supraorbital pit line.O.o.interrupta is distinguished from 0.o.potamophila by the infraorbital connected to the verticalantorbital pit line and the interrupted cross bands on the body.Each of O.o.obscura, O.o.interrupta and O.o.potamophila is distributed in western Japan,the western coastal slope of Korea and China,respectively.O.platycephala occurs throughout Korea except along the northern coast. The eleotrid goby genus Odontobutis has been Nichols(1943)recognized E.potamophila as represented by only one species,O.obscura different from O.obscura and changed the (Temminck et Schlegel),distributed throughout generic name of potamophila from Odontobutis the freshwaters of Japan,Korea,China and the to Philypnus. Philippines. This study,by examining materials collected Eleotris obscura Temminck et Schlegel,1848 from Japan,Korea and China,revealed that was described from near Nagasaki,Kyushu, the genus contains two species,O.obscura and Japan.The genus Odontobutis with obscura as O.platycephala sp.nov.,and the former con- the type species was erected by Bleeker(1874). sists of three subspecies obscura,potamophila This generic name was used by the following and interrupta subsp.nov. authors:Jordan and Snyder(1901a),Herre (1927),Koumans(1953)and Miyadi et al. Materials and methods (1976).Jordan and Seale(1905)transferred Measuring and counting procedures followed this species from Odontobutis to Mogurnda and Hubbs and Lagler(1958)with the following some authors followed them:Tomiyama(1936), additions.Body depth was measured at the Jeong(1954,1977),Matsubara(1955),Aoyagi pectoral origin,body width at the first dorsal (1957),Okada(1959-60)and Fowler(1962). origin,head width at the preopercular margin Jordan and Synder(1901b)altered the species and head depth at the postocular.Lateral name from obscura to obscurus,and Nakamura scale rows were counted from the upper end of (1963)followed them. the gill opening to the base of the caudal fin, On the other hand,two species of Odonto- transverse scales from the origin of the second butis,O.potamophila and 0.wui,were re- dorsal fin to the anal base.Lateral scales with ported from China.Odontobutis potamophila pit organs were defined as the scales which pos- (Giinther,1861)was synonymized with M. sesses pit organs.Counts for vertebrae were obscura by Tomiyama(1936),Okada(1959-60) taken from radiographs.Observations of the and Fowler(1962).O.wui(Chen,1934)was arrangement of pit organs and sensory canals synonymized with M.obscura by Fowler(1962) . were made on specimens stained with cyanine. ―373― 魚類学雑誌 Japan.J.Ichthyol.31(4),1985 The materials examined are listed in each gill openings,while Odontobutis is characterized species account.In the lists of materials,data by the presence of smooth bony crests on the for the specimens are given in the following dorsal side of eyes and quite wide gill openings. order:catalogue number,number of individuals, Therefore,we separate Odontobutis from Mog- standard length,collecting locality,collecting urnda. date.Abbreviations for the catalogue numbers of the specimens are:NSMT-P,Department of Key to the species of Odontobutis Zoology,National Science Museum,Tokyo; Fig.1) ( HUMZ,Laboratory of Marine Zoology,Faculty 1(6)Sensory canals absent on preoperculoman- of Fisheries,Hokkaido University;MTUF,the dibular pit line;first dark crossbands Museum of Tokyo University of Fisheries; from half the middle of the first dorsal fin YCM-P,Yokosuka City Museum;ZUMT, downward. Department of Zoology,University Museum, 2(3)Sensory canal absent at postocular on University of Tokyo;EUB,Laboratory of supraorbital pit line(Japan) Biology,Faculty of Science,Ehime University; •c O.obscura obscura LICPP,Laboratory of Ichthyology,the Crown 3(2)Sensory canal present at postocular on Prince's Palace,Tokyo;SMWU,Sang Myung supraorbital pit line(Sensory canal c in Women's University,Seoul;BMNH,British Fig.1C-F). Museum(Natural History),London;RMNH, 4(5)Infraorbital and verticalantorbital pit lines Rijksmuseum van Natuurlijke Historie,Leiden; pit lines 6 and 7 in Fig.1G-H)not (con- USNM,National Museum of Natural History, nected(China)O.o.potamophila Smithsonian Institution,Washington. 5(4)Infraorbital and verticalantorbital pit line connected;dark bands on body interrupted Genus Odontobutis by pale longitudinal line on each darsal Odontobutis Bleeker,1874,p.305(type-species, side(Korea)0.o.intetrupta subsp.nov. Eleotris obscura Temminck et Schlegel,1848). 6(1)Two sensory canals(d-e in Fig.1H)pre- Diagnosis.Preopercle without spine;no sent on preoperculomandibular pit line, teeth on vomer;gill openings continued forward also three(a-c in Fig.1G)on supra- below eyes;smooth,feeble bony crests on orbital pit line:first dark crossbands on dorsal sides of eyes;interorbital width wider body occupying the area from posterior than eye diameter;predorsal scales are extended half of first dorsal fin to origin of second forward on upper surface of head to between dorsal fin(Korea) hind nostrils;tongue round,mostly free. •cO. platycephala sp.nov. Description.First dorsal spines VI-VIII, third or fourth spine longest;second dorsal rays Odontobutis obscura obscura 7-10;anal rays 5-9;pectoral rays 13-17;pelvic Temminck et Schlegel)( I,5;lateral scale rows 31-51;lateral scales with Japanese name:Donko)( pit organs 25-34;transverse scales 12-24; Figs.1A,B,2A)( predorsal scales 20-40;branchiostegal rays 6; Eleotris obscura Temminck and Schlegel,1848,p. abdominal vertebrae 13-16;caudal vertebrae 149,pl.77,figs.1-3(near Nagasaki,Kyushu, 14-18;total vertebrae 28-33.Pelvic fins sepa- Japan). rated.Two dorsal fins separated.Body stout. Odontobutis obscura:Bleeker,1874,p.305(near Head large,cheek and opercle scaled.Mouth Nagasaki,Kyushu,Japan). large,oblique,maxillary reaching below anterior Odontobutis obscurus:Jordan and Synder,1901b,p. border of eye.Lower jaw prominent.Con- 43(Kurume,Tokyo,Japan);Nakamura,1963, ical teeth in rows on both jaws. p.187,fig.140(Otsu,Japan). Mogurnda obscura:Jordan and Seale,1905,Chinese Remarks.Many authors synonymized Odon- specimens,none described from Japan;Aoyagi, tobutis with Mogurnda(Jordan and Seale,1905; 1957,p.214,figs.179-180(Japan);Okada,1959- Tomiyama,1936;Matsubara,1955;Aoyagi, 60,p.649,fig.112(Japan). 1957;Okada,1959-60;Fowler,1962).Mogurnda Material examined.Holotype:RMNH 2040 a, has no bony crests on the head and medium wide 133.0mm SL,near Nagasaki,Kyushu,Japan,col- ―374― Iwata et al.:Revision of Odontobutis C B D E G F H Fig.1.Schematic figures of the sensory canals and pit organs of Odontobutis.A,B,Odontobutis obscura obscura;C,D,0.o.potamophila;E,F,O.o.interrupta;G,H,O.platycephala. lecting date unknown. River,Usa-gun,Ohita Pref.,Jan.4,1980;NSMT-P Paratypes:RMNH 2039 a-d and 2040 b-e,near 22401,6,29.5-37.1,Uji River,Takao-gun,Kyoto- Nagasaki,Kyushu,Japan,collecting date unknown. fu,May 12,1979:HUMZ 101282-101285,4,77.7- Additional specimens :312 specimens.NSMT-P 95.1,collecting locality same as in NSMT-P 22396, 22396,5,98.3-120.8,Kawabe River,Minokoshi, July 13,1979;HUMZ 101286-101294,9,28.0-50.4, Kita-gun,Ehime Pref.,July 22,1979;NSMT-P Ishide River,Matsuyama-shi,Ehime Pref.,May 17, 22397,20,73.3-82.6,collecting locality same as in 1979;HUMZ 101295-101296,2,88.4-121.5,Hiji NSMT-P 22396,July 22,1980;NSMT-P 22398,4, River,Hataki,Ohzu-shi,Ehime Pref.,Sep.15,1979; 19.3-68.9,Ichijo River,Yasuhaga-cho,Fukui-shi, HUMZ 101297,1,43.9,Shigenobu River,Mori- Fukui Pref.,Nov.1,1979;NSMT-P 22399,1,83.4, matsu,Ehime Pref.,May 5,1979;HUMZ 101298, Yamato River,Furuse,Gose-shi,Nara Pref.,Oct. 1,56.9,collecting locality same as in HUMZ 101297, 27,1979;NSMT-P 22400,2,47.2-69.0,Mimata May 9,1979;HUMZ 101299-101300,2,109.6- ―375― 魚類学雑誌 Japan.J. Ichthyol.31(4),1985 125.1,collecting locality same as in NSMT-P 22396, 1983.11.4.14-17,4,38.3-90.1,Arieda River,Ueda, Apr.28,1980;HUMZ 101301-101306,6,21.8- Kamiukena-gun,Ehime Pref.,Aug.5,1979;BMNH 35.4,Hatahoko River,Kofure,Iki-gun,Nagasaki 1983.11.4.18,1,86.8,Kuma River,Futasebashi, Pref.,Sep.13,1980:MTUF 25018,15,19.8-120.4, Kamiukena-gun,Ehime Pref.,Aug.5,1979:USNM Kannon River,Ushinotani,Fukui Pref.,Nov.1, 264892,7,61.4-83.2,Arieda River,Yanai,Mikawa- 1979;MTUF 25019,4,82.4-119.2,Katsura River, cho,Kamiukena-gun,Ehime Pref.,Aug.5,1979; Nishikyo-ku,Kyoto-fu,May 1,1979;MTUF 25020, USNM 264893,4,63.6-89.0,Kuma River,Koudono, 1,67.3,Kizu River,Yahata-cho,Ayaki-gun,Kyoto- Nishimyoujin,Kuma-cho,Kamiukena-gun,Ehime fu,May 1,1979;MTUF 25021,9,19.8-73.3,Mori- Pref.,Aug.5,1979;USNM
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